💡 Detailed Explanation
The verb '消す' (kesu) means 'to turn off', 'to extinguish', or 'to erase'. In the event of an earthquake, turning off cooking flames ('火を消す') is the primary safety step to prevent fires. The other options do not collocate with fire: 'なくす' means to lose/eliminate, 'やめる' means to stop an action, and 'とじる' means to close (a book/eyes).